Issue #17976: Fixed potential problem with file.write() not detecting IO error
by inspecting the return value of fwrite().  Based on patches by Jaakko Moisio
and test by Victor Stinner.
Skip test for issue #17976 if /dev/null is not available.
Fixed leak in sys.flags initialization.
Issue #16404: Add checks for return value of PyInt_FromLong() in
sys.getwindowsversion() and ossaudiodev.setparameters().
Reported by Ned Batchelder.
Circumventing a bug in glibc (issue #17976).
Patch by Jaakko Moisio.
20004: Note that the setter in csv.DictReader is broken.

This is a comment in the code because only someone reading the code would try
setting fieldnames to None in the first place...
Issue #20007: HTTPResponse.read(0) no more prematurely closes connection.
Original patch by Simon Sapin.
Issue #20006: Fix sporadic failures in test_weakset.
#19855: uuid.get_node now looks on the PATH for executables on unix.

Patch by Serhiy Storchaka.